The laws for drunk driving and the punishment for drunk driving can depend on the state you're in.
But in most states if the DUI is your first offense then you'll likely go to jail for 6 months to a year and maybe a fine of $500.00 to $1,000.00 depending on the state and their laws.
For your second DUI you may get 3 to 5 years in prison plus another fine and for your 3rd DUI you'll usually get up to 10 years in prison.
A friend of mine had a 3rd DUI and he got 10 years in prison.